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Car and Auto Forums > Auto Tech > HELP: ****sche ...
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HELP: ****sche 944 no spark

by jonb55198@[EMAIL PROTECTED] May 12, 2008 at 08:29 PM

Hi Group,

The other day my car would not start.  The battery is fully charged
and the starter cranks well.  My friend and I did some preliminary
diagnosis with which we discovered:

1. There is 12V at the ignition coil (both wires to ground).
2. The resistance/impedance numbers of the coil are within spec.
3. There is no water in the coil, we displaced it with lubricant and
the protective boot looked ok anyway.
4. We hooked up a 2 different spark plugs to the output wire of the
coil (the wire that goes from the coil to the cap) and then grounded
it and turned the key into the ON position (but not the start
position) and did not get any spark.
5. There is fuel in the rail.

My question is, if there is 12V at the ignition coil, and the
resistance numbers are ok, could it still be a bad coil, or does this
point to something else like a bad DME/ECU, a bad DME Relay, a bad
crank position sensor or speed sensor?

I've read in other posts that when these sensors go bad, there is no
spark... but did the authors of these posts mean to write that when
these sensors go bad, there will NOT be 12V at the coil?  Please
help.  Thanks.
 




 17 Posts in Topic:
HELP: Porsche 944 no spark
jonb55198@[EMAIL PROTECTE  2008-05-12 20:29:44 
Re: HELP: Porsche 944 no spark
Steve Austin <saustin4  2008-05-13 07:50:16 
Re: HELP: Porsche 944 no spark
jonb55198@[EMAIL PROTECTE  2008-05-13 06:42:59 
Re: HELP: Porsche 944 no spark
kludge@[EMAIL PROTECTED]   2008-05-13 10:17:25 
Re: HELP: Porsche 944 no spark
N8N <njnagel@[EMAIL PR  2008-05-13 06:50:53 
Re: HELP: Porsche 944 no spark
jonb55198@[EMAIL PROTECTE  2008-05-13 06:58:57 
Re: HELP: Porsche 944 no spark
"HLS" <nospa  2008-05-13 08:59:55 
Re: HELP: Porsche 944 no spark
"Andre" <rho  2008-05-13 09:13:45 
Re: HELP: Porsche 944 no spark
kludge@[EMAIL PROTECTED]   2008-05-13 10:18:43 
Re: HELP: Porsche 944 no spark
jonb55198@[EMAIL PROTECTE  2008-05-13 07:10:55 
Re: HELP: Porsche 944 no spark
kludge@[EMAIL PROTECTED]   2008-05-13 10:13:38 
Re: HELP: Porsche 944 no spark
darthpup <amchitka@[EM  2008-05-13 15:57:39 
Re: Porsche 944 no spark
"William Noble"  2008-05-13 23:18:46 
Re: Porsche 944 no spark: SOLUTION FOUND!
jonb55198@[EMAIL PROTECTE  2008-05-14 09:02:28 
Re: Porsche 944 no spark: SOLUTION FOUND!
"William Noble"  2008-05-14 23:01:53 
Re: HELP: Porsche 944 no spark
"Paul Hovnanian P.E.  2008-05-14 11:08:24 
Re: HELP: Porsche 944 no spark
someone@[EMAIL PROTECTED]  2008-05-14 19:04:07 

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tan12V112 Fri Dec 5 3:42:24 CST 2008.